Thomas Tompion (1639–1713) was an English clock maker, watchmaker and mechanician who is still regarded to this day as the Father of English Clockmaking. Tompion's work includes some of the most historic and important clocks and watches in the World and can command very high prices whenever outstanding examples appear at auction. A plaque commemorates the house he shared on Fleet Street with his equally famous pupil and successor George Graham.

Tompion's apprentices included George Allett, Edward Banger, Henry Callowe (Callot), Daniel Delander, Richard Emes, Ambrose Gardner, Obadiah Gardner, William Graham (nephew of George Graham), George Harrison, Whitestone Littlemore, Jeremiah Martin, Charles Molins (Molyns), William Mourlay, Charles Murray, Robert Pattison, William Sherwood, Richard Street, Charles Sypson, William Thompson, James Tunn and Thomas White many of whom became important makers and workmen in their own right.

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Thomas Tompion was born around 1639 and was baptized on 25 July 1639 in Northill, Bedfordshire, England.[1] The Worshipful Company of Clockmakers maintains the family cottage in Ickwell, his home hamlet in the parish of Northill. He was the eldest son of a blacksmith, also named Thomas Tompion, and probably worked as a blacksmith until 1664 when he became an apprentice of a London clockmaker. Very little of his earlier years is known. The first reference to Tompion in London is recorded around the end of 1670 in Water Lane (now Whitefriars Street) off Fleet Street.

His early clock-making style shows a strong connection with Joseph Knibb. This is of interest as Tompion's most important early patron was the scientist Robert Hooke who may well have known the Knibb family, as both were in Oxford. Hooke's relationship with Tompion was the key to his success as it opened doors to royal patronage as well as giving him access to the latest technology.

Tompion's excellence was based on the sound design of his productions as well as the high quality of the materials used. This together with the outstanding skills of the workmen he employed gave him an unrivalled reputation throughout the known world. Many of these workmen had French and Dutch Huguenot origins, for example Daniel and Nicholas Delander, Henry Callot and Charles Molyns, the latter possibly related to the family Windmills. Importantly, those Huguenots who worked for him in the sphere of decorative arts were able to execute Tompion's demands for the high quality workmanship on which he founded his unrivalled reputation. Tompion was an early member of the Clockmakers' Company of London — he joined in 1671 and became a master in 1704.

When the Royal Observatory was established in 1676, King Charles II selected Tompion to create two identical clocks based on Hooke's idea of a very long pendulum swinging in a very small arc. These were fixed in the Octagon room, each was driven by a deadbeat escapement designed by Richard Towneley, with both clocks only needing to be wound once a year. They proved to be very accurate and were instrumental in achieving the correct calculations needed for astronomical observations.

Due to his relationship with the scientist Robert Hooke he made some of the first watches with balance springs, these had the potential to be much more accurate than earlier watches. Several different kinds were experimented with, including an early type with double balances geared together in order to eliminate errors of motion. One of these was made for King Charles II and was signed "Robert Hooke invent. 1658. T. Tompion fecit, 1675". William Derham mentions this in his book The Artificial Clockmaker.[2] This watch, it seems, has not survived. The final form of balance spring arrangement used by Tompion was a plain spiral with a single balance, indeed the same arrangement employed by Christiaan Huygens in watches made for him by Thuret. A few of Tompion's early spiral balance spring movements were also of a similar specification to the Huygens/Thuret pattern as they had a standing barrel and no fusee. Huygens imagined that the latter would not be necessary as the spiral spring would render the balance isochronous. Tompion must have soon found this rather optimistic surmise was however incorrect, as all Tompion's subsequent spiral balance spring movements have fusees, and this design became the standard pattern in English watches throughout the 17th and 18th centuries.

It is often stated that Tompion invented the particular type of balance spring regulation in pocket watches widely used until the late 19th century. This has the curb pins mounted on a sector rack, and moved by a pinion on which is mounted a graduated and numbered disc. While this system was used by Tompion, many refer to it incorrectly as the 'Tompion regulator'. However, he certainly did not invent this system, as such regulating devices were already in use by the 1670s on French balance spring watches of the Thuret pattern.

As England's most prominent watchmaker, Tompion's workshop built about 5,500 watches and 650 clocks during his career.[3] Tompion's clocks are known for their ingenuity of design and robust construction. His three-train grande sonnerie bracket clocks are masterpieces. Those interested in mechanics are particularly attracted to the mechanisms of such clocks and his repeating watches as they are quite complex, indeed it could even be said over-complex, though efficient in operation. He shares this characteristic with the later French-Swiss watchmaker Breguet.

Another of Tompion's innovations was to create a numbering system for his spring and longcase clocks, which is thought to be the first time that a serial numbering system was applied to manufactured goods.

Tompion went into partnership with Edward Banger in 1701 until about 1707 or 1708, when it was dissolved in circumstances which are not at all clear. Certainly from around 1711 it was George Graham who was in partnership with Tompion. Some of his later productions are jointly signed, and mysteriously some clocks have this signature on a separate plate which overlays that of Tompion and Banger engraved on the dial plate proper.

George Graham, went on to further develop the designs of both scientific instruments as well as clocks and watches after Tompion's death, and he also continued Tompion's numbering system for his clocks and watches.

Thomas Tompion died on 20 November 1713 and was buried in Westminster Abbey, George Graham being buried alongside him in 1751. Many of his clocks are still operational today, including two of his one-year clocks in Buckingham Palace. Many of his watches survive and due to their sound construction still continue to work, as predicted by Hatton in 1773.

The modern Swiss wristwatch brand "Tompion" of the so-called "British Masters" series has no connection either with Thomas Tompion or the original firm of that name.

Cescinsky, Herbert (1938). Old English Master Clockmakers and Their Clocks 1670 to 1820. London: George Routledge and Co.

Dawson, Percy G.; Drover, C.B.; Parkes, D.W. (1994) [1982]. Early English Clocks – A Discussion of Domestic Clocks up to the Beginning of the Eighteenth Century. Woodbridge: The Antique Collectors' Club.